Textile bobbin and method of forming same



June 1, 1954 c, DUNLAP 2,679,989

TEXTILE BOBBIN AND METHOD OF FORMING SAME Filed April 7, 1951 6 Sheets-Sheet l 25 INVENTOR.

CHAIFLEJ K DUNK. 4/ BY June 1, v 1954 c.. K. DUNLAP' TEXTILE BOBBIN AND METHOD OF FORMING SAME Filed April 7, 1951 6 Sheets-Sheet 2 c/umnas Koo/v1.41:

.ATTOIPIYEIJ June 1, 1954 cfK. DUNLAP TEXTILE BOBBIN AND METHOD OF FORMING SAME 6 Sheets-Sheet :5

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IQv'VEN TOR.

CHARLES A. DU/VLAP A TTOPIYEVJ June 1, 1954' c. K. DUNLAP I 2,679,989

TEXTILE BOBBIN AND METHOD OF FORMING SAME awmmsw ATTORNEY-.5

June 1, 1954 c. DUNLAP TEXTILE BOBBIN AND METHOD OF FORMING SAME Filed April 7; 1951 6 Sheets-Sheet 5 ||I?l\ 1| T J l l I I l I I I l I l l I l| l l I I l ll T. ||||||l||l||lil| ||llll|lll| l|||r Il I V I I I I l I I 1 I I I 1 1 I I I l I I I 1 I 1 I I i I IN VEN TOR.

Patented June 1, 1954 TEXTILE BOBBIN AND METHOD OF FORMING SAME Charles K. Dunlap, Hartsville, S. 0., assignor to Sonoco Products Company, a corporation of South Carolina Application April 7, 1951, Serial No. 219,859

12 Claims. 1

. This invention relates to textile bobbins for use as a core for yarn packages, and more particularly to bobbins of this sort that are specially constructed to withstand the excessive compression stresses encountered in handling yarns such as nylon which have unusual elastic properties or elastic type yarns in general such as those that are rubberized.

The compression stresses which accummulate under normal winding tensions as yarn packages are wound with such yarns have made it necessary to employ bobbins that are specially reinforced to Withstand crushing. The reinforcement arrangements heretofore used for this purpose have characteristically incorporated a metal reinforcing sleeve in order to obtain adequate strenth, despite the fact that this has resulted in most instances in an undesirably heavy bobbin construction and has substantially increased the bobbin cost.

According to the present invention there is now provided a lightweight bobbin reinforcing arrangement which may be formed entirely of paper, and which has a very substantial cost advantage over the metal reinforcements previously employed. The reinforcement arrangement of the present invention is characterized by the use of a reinforcing liner composed of paper bodies that have been collapsed to arcuate form from an original tubular shape. The paper bodies formed in this manner can be made exceptionally dense and strong, and they may be used with great flexibility in a variety of reinforced bobbin constructions and even where it is desired to convert or use salvaged elements from old metal reinforced bobbins. mThese and other features of the present invention are described in detail below in connection with th eaccompanying drawing, in which:

Fig. 1 is an elevation of a bobbin embodying the present invention;

Fig. 2 is a vertical section of the bobbin shown in Fig. 1;

- Fig. 3 is a sectional detail taken substantially on the line 3--3 in Fig. 2;

Fig. 4 is a sectional detail taken substantially on the line 44 in Fig. 2;

' Fig. 5 is an exploded perspective view illustrating the manner of forming reinforcing sections according to the present invention from a paper body having an original tubular shape; Fig. 6 is a further perspective view corresponding to Fig. 5, but illustrating the final forming of the reinforcing sections;

Fig. '7 is an exploded perspective view illustrating the manner of assembling a bobbin such as is shown in Figs. 1 to 4 with reinforcing sections prepared as illustrated in Figs. 5 and 6;

Fig. 8 is an elevation of a further embodiment of the present invention;

Fig. 9 is a vertical section taken substantially on the line 9-9 in Fig. 8;

Fig. 10 is a section taken substantially on the line IBI0 in Fig. 9;

Fig. 11 is a section taken substantially on the line H-|l in Fig. 9;

Fig. 12 is an elevation of a third embodiment of the present invention;

Fig. 13 is a vertical section taken substantially on the lines i3-l3 in Fig. 12;

Fig. 14 is a section taken substantially on the line 14-14 in Fig. 13;

Fig. 15 is a section taken substantially on the line l5l5 in Fig. 13;

Fig. 16 is an elevation of a fourth embodiment of the present invention;

Fig. 17 is an elevation showing the interior face of one of the reinforcing sections incorporated in the embodiment shown in Fig. 16;

Fig. 18 is a vertical section taken substantially on the line l8l8 in Fig. 16;

Fig. 19 is a section taken substantially on the line l9-I9 in Fig. 18;

Fig. 20 is a section taken substantially on the line 20-20 in Fig. 18;

Fig. 21 is an elevation of a fifth embodiment of the present invention;

Fig. 22 is a vertical section taken substantially on the line 22-22 in Fig. 21;

Fig. 23 is a section taken substantially on the line 2323 in Fig. 22; and

Fig. 24 is a bottom end view corresponding to Fig. 22.

The embodiment of the present invention shown in Figs. 1 to 4 of the drawings illustrates the manner in which this invention may be employed for converting old metal reinforced bobbins to an increased circumferential size. An old metal reinforced bobbin is indicated generally in Figs. 1 to 4 by by the reference numeral 25, and as shown comprises a usual arrangement of an outer bobbin barrel 26 of paper or the like that is fitted with a metal reinforcing sleeve 2'! and a drive end cap 28, a spindle bushing 29 and a nose cap 30.

Under certain circumstances it is sometimes desirable to increase a previously used bobbin size in order to obtain a more favorable angle of pull in the winding of yarn packages. Where the previously used types of metal reinforced bobbins have been employed, however, the capital investment in such bobbins has normally been so great that the change to an increased bobbin size could not be justified from a cost standpoint. The present invention allows such bobbins to be converted directly to an increased size easily and inexpensively.

According to the present invention, this conversion is made simply by providing a new bobbin barrel 3% having the larger circumferential size desired, and disposing specially formed reinforcing sections 32 between the new bobbin barrel 3! and the initial bobbin structure 25.

The nature of these reinforcing sections 32 and the manner in which they are formed is illustrated in Figs. 5 and 6 of the drawing. Fig. 5 shows a tubular paper body 'I disposed in a die block D in line with a cooperating punch P, and Fig. 6 shows the punch P closed on the die block D to collapse the originally tubular shaped paper body T to an arcuate cross section and thereby form a reinforcing section 32. The tubular paper body members T from which the reinforcing sections 32 are formed in this manner are preferably convolutely wound paper tubes, having a wall thickness corresponding substantially with the Wall thickness desired in the reinforcing section 32, and preferably also having a resin adhesive applied to secure its windings, or alternatively or additionally being resin dipped after forming, so that a resin bonding and setting of the collapsed tube structure can be obtained in forming the reinforcing sections 32; and for which purpose the die block D and punch P may be heated in any convenient manner. In the course of forming the reinforcing sections 32 by collapsing the paper tubes T sufiicient pressure can be applied by the punch P and die D to compress the tube structure so that the resulting reinforcing section has a wall thickness of the same order as that of the original tube 'I and accordingly has a very substantially greater density and strength than the original tube T. Also, the collapsing of the reinforcing sections 32 from an original tubular shape results in a final structure that has the original tubular windings doubled upon themselves, and which has been found to increase the strength of the reinforcing sections 32 substantially.

The dense, highly compressed, reinforcing sections 32 formed in this manner exhibit excellent strength characteristics for use in a reinforced bobbin construction, and allow an old metal reinforced bobbin 25 such as is shown in Figs. 1 to 4 to be increased in size without requiring any additional metal reinforcing. The manner of disposing such reinforcing sections 32 for increasing the size of the old metal reinforced bobbin 25 is illustrated in Fig. '7, in which the reinforcing sections 32 are shown ready to be disposed compositely as a reinforcing and filler section between the initial bobbin structure 25 and the new bobbin barrel 3!. Usually it will be desirable to apply a coating of glue or other adhesive to the winding surface of the initial bobbin structure 25 and to the outer surface of the reinforcing sections 32 in order to bind the assembly together. Alternatively, the completed assembly may be dipped in a resin adhesive and then baked out to obtain a set resin bond.

A further feature of a converted bobbin structure arranged as described above is that by forming an inturned upper end on the bobbin barrel 3I as at 33 (compare Figs. 2 and 7), this inturned end 33 can be arranged in abutting relation to the tip of the initial bobbin structure 25 and thereby locked in place to form a smooth and sturdy bobbin nose.

The further embodiment illustrated in Figs. 8 to H of the drawings illustrates the manner in which a reinforced bobbin construction may be formed in accordance with the present invention to incorporate salvaged elements from old metal reinforced bobbins. In this embodiment, the bobbin of the present invention, which is indicated generally by the reference numeral I00, comprises a bobbin barrel If and two collapsed reinforcing sections I82 of semicircular form disposed interiorly of the bobbin barrel IIlI as a composite reinforcing liner extending substantially the entire length of the bobbin barrel IDI. In addition, a metal reinforcing sleeve I63 is disposed interiorly of the reinforcing sections I02 to extend lengthwise at the central portion thereof where the yarn package compression stresses that have to be withstood are usually the greatest. In cases where such metal sleeves 563 may be salvaged from old metal reinforced bobbins, such an arrangement can be used to good advantage because it allows the reinforcing sections I32 to be specially strengthened at the point of greatest stress so that they do not need to be formed for comparable strength over their entire length. To complete the bobbin Hill, a molded paper spindle bushing Hi l may be fitted inside the reinforcing liner formed by the sections I02 against the adjacent shoulder of an interior boss I02, and drive and nose end fittings (not shown) may be added too if desired. In some cases it may be practical to salvage the spindle bushing and end fittings from the old metal reinforced bobbins for use in the bobbin I39. The interior bosses H32 are formed in the reinforcing sections IE2 as an abutment for the spindle bushing I04, as noted above, and may be arranged to abut the lower end of the metal reinforcing sleeve I83 too, if desired, for this provides a way of keeping the bobbin structure very sturdily in assembled alignment. In any case, it will be found convenient to arrange the bosses I52 Wherever possible at equal distances from the ends of the reinforcing sections 32 so that they may be assembled in either direction.

The third embodiment illustrated in Figs. 12 to 15 of the drawings illustrates one method of forming a reinforced bobbin construction entirely of paper according to the present invention. The bobbin of this embodiment is indicated generally by the reference numeral 2%, and comprises an outer bobbin barrel 231 in which collapsed reinforcing sections in at least two sets as at 232 and 203 are shaped with respective arcuate forms proportioned for nesting concentrically as a multi-layer reinforcing liner inside the bobbin barrel 23 I. With this arrangement, the reinforcing sections 202 and 263 can still be formed simply and easily with no greater wall thickness than in the embodiments already described above, while providing an effective thickness and resulting strength of the nested reinforced sections as great as may be required. In this connection, the concentrically nested reinforcing sections 202 and 233 are preferably arranged in staggered relation so that the mating edges of one set of the reinforcing sections 232 are disposed in relation to the faces of the reinforcing sections 203 of another set to increase further the strength of the resulting reinforcin liner. As before, this reinforcing liner for the bobbin 260 may be fitted internally with a molded paper spindle bushing 204 or the like, and end fittings (not shown) may be used as desired. A particular feature of this type of bobbin construction is that it avoids any. metal reinforcing sleeve of large diameter, and therefore keeps the center of gravity of the bobbin closer to its axis, so that the matter of balance is not nearly so critical as in previous types of reinforced bobbins; and this remains true even if a metal sleeve is with this type of bobbin 200. for the plural sets of reinforcing sections 202 and 203 make it possible to use an interior metal sleeve relatively very small in diameter.

The fourth embodiment shown in Figs. 16 to 20 of the drawings illustrates a bobbin construction 300 according to the present invention in which an outer bobbin barrel 30l is reinforced with collapsed reinforcing sections 302 that are molded by the collapsing pressure with an interior configuration providing a recessed base portion as at 303 for engaging spindle driving lugs, a spindle clearance bore as at 304, a seat as at 305 for a spindle bushing as at 306, and a lifting groove 30! and an identification disc seat at the tip portion thereof. With reinforcing sections 302 of this sort, fully adequate reinforcing strength is not only provided but also any necessity for separate and fittings to complete the bobbin structure is eliminated.

The fifth and last embodiment shown in Figs. 2'1 to 24 of the drawings comprises a bobbin 400 constructed in accordance with the present invention to be used in the same manner as the metal reinforced wooden bobbins now being used to a great extent. These wooden bobbins consist of a wooden bobbin barrel fitted interiorly with a metal sleeve of spindle size, so that the wooden barrel portion is of substantial cross section. Despite this substantial cross section of the wooden bobbin barrel portion, however, considerable difficulty has been experienced with these bobbins because of the tendency of the bar.- rel portion to deform under the yarn package compression stresses. The bobbin 400 of the present invention replaces this wooden bobbin portion with an outer bobbin barrel 40! lined with collapsed reinforcing sections 402 shaped in mating halves to fill the space between the bobbin barrel 40! and the usual type of metal spindle tube 403. The collapsed reinforcing sections 402, because of their dense and highly compressed structure as mentioned above, reinforce the bobbin 400 Well against the yarn package compression stresses which have caused dimculty as noted above with the wooden bobbin previously used, and furthermore, they provide a bobbin construction that is considerably less expensive than the reinforced Wooden bobbins heretofore used. Also, the reinforcing sections 402 may be molded easily during the collapsing process to form a recessed drive end portion as at 404 without requiring any separate operation or the use of any separate fitting for this purpose.

The present invention has been described in detail above for purposes of illustration only and is not intended to be limited by this description or otherwise except as defined in the appended claims.

I claim:

1. A textile bobbin for use as a core for yarn packages comprising an outer bobbin barrel, and a plurality of reinforcing sections of arcuate cross section disposed interiorly of said outer barrel, said reinforcing sections each being formed of a continuous ply laminated paper body doubled upon itself in arcuate form.

' 2. A textile bobbin for use as a core for yarn packages comprising an outer bobbin barrel, and a plurality of continuous ply laminated paper bodies doubled upon themselves in arcuate form, said paper bodies being disposed compositely inside said outer barrel as a reinforcing liner.

3. The method of forming a textile bobbin for use as a core for yarn packages which comprises forming a plurality of wound paper tubes, collapsing said paper tubes to arcuate form, and disposing said collapsed paper tubes as a composite reinforcing liner interiorly of a tubular member adapted to serve as an outer bobbin barre].

4. The method of forming a textile bobbin for use as a core for yarn packages which comprises winding a plurality of paper tubes, collapsing said paper tubes to arcuate form with a wall thickness substantially the same as that of the original paper tubes, and disposing said collapsed paper tubes as a composite reinforcing liner interiorly of a tubular member adapted to serve as an outer bobbin barrel.

"5. A textile bobbin for use as a core for yarn packages as defined in claim 2 and further characterized in that said textile bobbin additionally comprises an initial bobbin structure having a smaller than desired circumferential size, said outer bobbin barrel having a desired larger circumferential size, and said plurality of paper bodies being disposed compositely inside said outer barrel as a reinforcing liner and filler section between said outer barrel and said initial bobbin structure.

6. A textile bobbin for use as a core for yarn packages as defined in claim 5 and further characterized in that said outer barrel is formed with an inturned end that is disposed over said reinforcing liner and filler section in abutting relation to the tip of said initial bobbin structure and thereby locked in place to form a smooth and sturdy bobbin nose.

7. A textile bobbin for use as a core for yarn packages comprising an outer bobbin barrel, a plurality of continuous ply laminated paper bodies doubled upon themselves in arcuate form, said doubled paper bodies being disposed compositely as a reinforcing liner interiorly of said bobbin barrel and substantially coextensively lengthwise thereof, and a metal reinforcing sleeve disposed interiorly of said composite liner and extending lengthwise at the central portion thereof.

8. A textile bobbin for use as a core for yarn packages as defined in claim 2 and further characterized in that said doubled paper bodies are shaped in at least two sets with respective arcuate forms proportioned for nesting concentrically, and. sets of paper bodies are disposed interiorly of said outer bobbin barrel in nested concentric relation as a composite reinforcing liner.

9. A textile bobbin for use as a core for yarn packages as defined in claim 8 and further characterized in that said sets of concentrically nested paper bodies are arranged in staggered relation.

10. A textile bobbin for use as a core for yarn packages as defined in claim 2 and further characterized in that said doubled paper bodies are shaped in mating halves for disposition interiorly of said outer bobbin barrel, said mating halves each being semicircular and having an interior configuration providing a recessed base portion for engaging spindle driving lugs, a spindle clearance bore, a seat for an upper spindle bushing, and a lifting groove and identification disc seat at the tip portion thereof.

11. A textile bobbin for use as a core for yarn packages as defined in claim 2 and further characterized in that said doubled paper bodies are shaped in mating halves for disposition interiorly of said bobbin barrel, and having an interior configuration providing a recessed base portion for engaging spindle driving lugs and a bore to receive a spindle sleeve.

12. The method of forming a textile bobbin for use as a core for yarn packages as defined in claim 3 and further characterized in that said tubular member adapted to serve as an outer bobbin barrel is provided in an increased circumferential size with respect to an existing textile bobbin, said plurality of wound paper tubes are formed with a wall thickness corresponding substantially to the annular clearance of said tubular member over said existing bobbin and are collapsed to arcuate form with a wall thickness corresponding to said annular clearance, and said collapsed paper tubes are disposed as a composite reinforcing liner and filler section interiorly of said tubular member and exteriorly of said existing textile bobbin.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,860,020 Dunlap May 24, 1932 2,331,954 Atwood Oct. 19, 1943 2,359,604 Atwood Oct. 3, 1944 2,495,058 Dunlap Jan. 17, 1950 FOREIGN PATENTS Number Country Date 3,857 Great Britain Sept. 30, 1878 10,835 Great Britain Aug. 6, 1887 450,356 Great Britain July 8, 1936 

